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Author

Kim, Jin Young
Next Generation Energy Laboratory
Research Interests
  • Polymer solar cells, QD solar cells, organic-inorganic hybrid solar cells, perovskite solar cells, OLEDs, PeLEDs, organic FETs

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Photovoltaic polymers based on difluoroqinoxaline units with deep HOMO levels

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Title
Photovoltaic polymers based on difluoroqinoxaline units with deep HOMO levels
Author
Song, SuheeKeum, SanghaLee, Ji-HyunLee, JihoonKim, SeungminPark, Seong SooKim, Jin YoungPark, Sung HeumJin, Youngeup
Keywords
alkyl chain; fluorine atom; polymer; solar cells; synthesis
Issue Date
201807
Publisher
WILEY-BLACKWELL
Citation
JOURNAL OF POLYMER SCIENCE PART A-POLYMER CHEMISTRY, v.56, no.14, pp.1489 - 1497
Abstract
We report the synthesis of low bandgap polymers with a difluoroquinoxaline unit by Stille polymerization for use in polymer solar cells (PSCs). A new series of copolymers with 2,3-didodecyl-6,7-difluoro quinoxaline as the electron-deficient unit and alkyloxybenzo[1,2-b:4,5-b′]dithiophene and thiophene as the electron-rich unit were synthesized. The photovoltaic properties of the devices based on the synthesized polymers revealed that the fluorine atoms at the quinoxaline units aid in decreasing the highest occupied molecular orbital (HOMO) energy levels; this in turn increased the open circuit voltage of the devices. The polymers with long alkyl chains exhibited good solubility that increased their molecular weight, but the power conversion efficiency was low. Efficient polymer solar cells were fabricated by blending the synthesized copolymers with PC71BM, and the PCE increased up to 5.11% under 100 mW cm−2 AM 1.5 illumination. These results demonstrate that the importance of having a control polymer to be synthesized and characterized side by side with the fluorine analogues.
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DOI
http://dx.doi.org/10.1002/pola.29014
ISSN
0887-624X
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